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Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

🗓️ 22 Jul 2026 21:48:59Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 2 Views

Summary An attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending Sec-WebSocket-Version: 7 and omitting Connection: Upgrade / Upgrade: websocket headers, completing a protocol switch that a proxy would not recognize as...

Related
Detection
Refs
ReporterTitlePublishedViews
Family
CVE		CVE-2026-59898
22 Jul 202621:48
–cve
OSV		GHSA-4MP9-239F-G9HG Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
22 Jul 202621:48
–osv
Positive Technologies		PT-2026-63546
22 Jul 202600:00
–ptsecurity
Vulners
Node
OR
io.nettynetty-codec-httpRange<4.1.136.Finalmaven
io.nettynetty-codec-httpRange4.2.0.Final–4.2.15.Finalmaven

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22 Jul 2026 21:49Current
5.4Medium risk
Vulners AI Score5.4
CWE-444
2